Patents by Inventor Toshiji Yokotani

Toshiji Yokotani has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Ink follower composition for ballpoint pen and ballpoint pen using the same
    Patent number: 6200053
    Abstract: An ink follower composition for ballpoint pens which comprises (1) a hardly volatile liquid and (2) expansible synthetic mica having a quaternary ammonium ion introduced therein or an ink follower composition for ballpoint pens which comprises (1) a hardly volatile liquid, (3) synthetic mica, and (4) a thickener, and a ballpoint pen having the ink follower composition. The ink follower composition follows ink without leaving ink behind on the inner wall of an ink container.
    Type: Grant
    Filed: December 10, 1999
    Date of Patent: March 13, 2001
    Assignee: The Pilot Ink Co., Ltd.
    Inventors: Hideaki Asami, Toshiji Yokotani